| Env. control A | -- | 1 | U -SN76477- |
28 | -- | Env. control B |
| GND | -- | 2 | 27 | -- | Mixer control A | |
| ? | -- | 3 | 26 | -- | Mixer control B | |
| ? | -- | 4 | 25 | -- | Mixer control C | |
| res | -- | 5 | 24 | -- | Monostable res | |
| cap | -- | 6 | 23 | -- | Monostable cap | |
| Envelope decay resistor | -- | 7 | 22 | -- | VCO/SLF selection | |
| ? | -- | 8 | 21 | -- | SLF cap | |
| ? | -- | 9 | 20 | -- | SLF res | |
| Envelope attack resistor | -- | 10 | 19 | -- | VCO duty cycle | |
| Volume | -- | 11 | 18 | -- | res | |
| ? | -- | 12 | 17 | -- | res | |
| ? | -- | 13 | 16 | -- | cap | |
| VCC | -- | 14 | 15 | -- | VCC |